Can my cramps and back pain be a result of a UTI?

Patient

Q: I have had a UTI for about five days now and it doesn't seem to be going away. I have been taking Bactrim and Pyridiun. This morning I woke up with severe cramps and lower back discomfort (made me cry and feel as if I could vomit). It's is not time to start my period (last one started Jan. 4th). What could be the issue?

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